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Cash and cash equivalents (Details) - BRL (R$)	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash and Cash Equivalents [Line Items]
Cash and banks	R$ 6,596,510,000	R$ 6,561,558,000
Cash and cash equivalents	R$ 9,018,818,000	8,345,871,000	R$ 9,505,951,000	R$ 13,590,776,000
Cash and banks | Fixed
Cash and Cash Equivalents [Line Items]
Average yield p.a. %	4.62%
Country of domicile
Cash and Cash Equivalents [Line Items]
Fixed-term deposits (compromised)	R$ 2,422,308,000	R$ 1,784,313,000
Country of domicile | Fixed-term deposits | CDI
Cash and Cash Equivalents [Line Items]
Percentage of basis used to calculate interest rate	100.96%

X

- Definition

The amount of cash balances held at banks.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

A classification of cash equivalents representing short-term investments. [Refer: Cash equivalents]

+ References

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- Definition

The percentage of the basis (reference rate) used for calculation of the interest rate.

+ References

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Cash and Cash Equivalents [Line Items]

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Rate of interest on investment.

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